Usually I have upgraded, but I currently have no intention of buying an iPhone 7 or later, unless they fix something! For me it's a double whammy. I don't like the lack of headphone jack, and whereas I feel like I could manage grumpily ... for me it kills the excitement of buying the new device, and I think that is important. (My standard listening headphones are Etymotic ER-4Ps; there is no way I am going to downgra…
Removing the headphone jack is just to get more money and control. First by selling dongles. Second after many people moved to new headphones they will introduce a license program for headphone vendors "Built for Apple" which costs say 10% of the headphone. Other headphones will no longer work (see what Sony did with PS4 bluetooth headphones).
Removing the headphone jack had absolutely nothing to do with selling dongles and everything to do with Apple doing what it always does: seeing which way the wind is blowing and dragging everyone kicking and screaming into their vision of the future.
They did the exact same thing with the floppy drive and optical drive, they're now doing the same thing with USB and the headphone jack, and within five years you can be sure that every single one of their competitors will have made the same decision.